ITK/Examples/Developer/MiniPipeline

MiniPipeline.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"
3. include "itkImageFileWriter.h"

1. include "ImageFilter.h"

template <typename TImage> static void CreateImage(TImage* const image);

int main(int, char*[]) {

 // Setup types
 typedef itk::Image<unsigned char, 2>   ImageType;
 typedef itk::ImageFilter<ImageType>  FilterType;

 ImageType::Pointer image = ImageType::New();
 CreateImage(image.GetPointer());

 std::cout << "Input:" << std::endl;
 std::cout << image->GetLargestPossibleRegion() << std::endl;
 // Create and the filter
 FilterType::Pointer filter = FilterType::New();
 filter->SetInput(image);
 filter->Update();

 std::cout << "Input:" << std::endl;
 std::cout << filter->GetOutput()->GetLargestPossibleRegion() << std::endl;
 
 typedef  itk::ImageFileWriter< ImageType  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("Output.png");
 writer->SetInput(filter->GetOutput());
 writer->Update();

 return EXIT_SUCCESS;

}

template <typename TImage> void CreateImage(TImage* const image) {

 // Create an image with 2 connected components
 typename TImage::IndexType corner = Template:0,0;

 unsigned int NumRows = 200;
 unsigned int NumCols = 300;
 typename TImage::SizeType size = Template:NumRows, NumCols;

 typename TImage::RegionType region(corner, size);

 image->SetRegions(region);
 image->Allocate();

 // Make another square
 for(unsigned int r = 40; r < 100; r++)
 {
   for(unsigned int c = 40; c < 100; c++)
   {
     typename TImage::IndexType pixelIndex;
     pixelIndex[0] = r;
     pixelIndex[1] = c;

     image->SetPixel(pixelIndex, 15);
   }
 }

}

</source>

ImageFilter.h

<source lang="cpp">

1. ifndef __itkImageFilter_h
2. define __itkImageFilter_h

1. include "itkImageToImageFilter.h"

1. include "itkRecursiveGaussianImageFilter.h"

namespace itk { template< class TImage> class ImageFilter:public ImageToImageFilter< TImage, TImage > { public:

 /** Standard class typedefs. */
 typedef ImageFilter             Self;
 typedef ImageToImageFilter< TImage, TImage > Superclass;
 typedef SmartPointer< Self >        Pointer;

 /** Method for creation through the object factory. */
 itkNewMacro(Self);

 /** Run-time type information (and related methods). */
 itkTypeMacro(ImageFilter, ImageToImageFilter);

 /** Image dimension. */
 itkStaticConstMacro(ImageDimension, unsigned int,
                     TImage::ImageDimension);

 /**  Smoothing filter type */
 typedef RecursiveGaussianImageFilter<
   TImage,
   TImage
   >    InternalGaussianFilterType;

 /**  Pointer to a gaussian filter.  */
 typedef typename InternalGaussianFilterType::Pointer InternalGaussianFilterPointer;

protected:

 ImageFilter();
 ~ImageFilter(){}

 /** Does the real work. */
 virtual void GenerateData();

private:

 ImageFilter(const Self &); //purposely not implemented
 void operator=(const Self &);  //purposely not implemented

 InternalGaussianFilterPointer m_SmoothingFilters[ImageDimension - 1];

}; } //namespace ITK

1. ifndef ITK_MANUAL_INSTANTIATION
2. include "ImageFilter.hxx"
3. endif

1. endif // __itkImageFilter_h

</source>

ImageFilter.hxx

<source lang="cpp">

1. ifndef __itkImageFilter_txx
2. define __itkImageFilter_txx

1. include "ImageFilter.h"
2. include "itkObjectFactory.h"
3. include "itkImageRegionIterator.h"

namespace itk {

template< class TImage> ImageFilter< TImage>

ImageFilter()

{

 // Instantiate all filters
 for ( unsigned int i = 0; i < ImageDimension; i++ )
   {
   m_SmoothingFilters[i] = InternalGaussianFilterType::New();
   m_SmoothingFilters[i]->SetOrder(InternalGaussianFilterType::ZeroOrder);
   m_SmoothingFilters[i]->SetDirection(i);
   }

 // Connect all filters (start at 1 because 0th filter is connected to the input
 for ( unsigned int i = 1; i < ImageDimension; i++ )
   {
   m_SmoothingFilters[i]->SetInput(
     m_SmoothingFilters[i - 1]->GetOutput() );
   }

}

template< class TImage> void ImageFilter< TImage>

GenerateData()

{

 const typename TImage::ConstPointer inputImage( this->GetInput() );

 const typename TImage::RegionType region = inputImage->GetRequestedRegion();
 const typename TImage::SizeType   size   = region.GetSize();

 m_SmoothingFilters[0]->SetInput(inputImage);

 m_SmoothingFilters[ImageDimension-1]->Update();

 // Copy the output from the last filter
 this->GraftOutput( m_SmoothingFilters[ImageDimension-1]->GetOutput() );

}

}// end namespace

1. endif

</source>

CMakeLists.txt

<syntaxhighlight lang="cmake"> cmake_minimum_required(VERSION 3.9.5)

project(MiniPipeline)

find_package(ITK REQUIRED) include(${ITK_USE_FILE}) if (ITKVtkGlue_LOADED)

 find_package(VTK REQUIRED)
 include(${VTK_USE_FILE})

endif()

add_executable(MiniPipeline MACOSX_BUNDLE MiniPipeline.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(MiniPipeline ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(MiniPipeline ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build MiniPipeline

Click here to download MiniPipeline and its CMakeLists.txt file. Once the tarball MiniPipeline.tar has been downloaded and extracted,

cd MiniPipeline/build

• If ITK is installed:

cmake ..

• If ITK is not installed but compiled on your system, you will need to specify the path to your ITK build:

cmake -DITK_DIR:PATH=/home/me/itk_build ..

Build the project:

make

and run it:

./MiniPipeline

WINDOWS USERS PLEASE NOTE: Be sure to add the ITK bin directory to your path. This will resolve the ITK dll's at run time.

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.

ItkVtkGlue

ITK >= 4

For examples that use QuickView (which depends on VTK), you must have built ITK with Module_ITKVtkGlue=ON.

ITK < 4

Some of the ITK Examples require VTK to display the images. If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.